First off, OP mentioned he got it for free in a conference raffle: Dell already achieved their free publicity/sponsorship/whatever by announcing this laptop in the beginning of the conference, and by the time the raffle winner was announced, it is already out of Dell's hands, and between OP and organisers. At this point, had he mentioned that he is probably not going to be using it at all because of his strong Mac preference, another ticket would have been drawn and hey presto.....

>>> The point of these beta tests is to get feedback from people

Exactly. And that's my main point. In all this time, feedback was not at all achieved (edit: contrast with, say @chimeracoder's review above), because by his own account, he barely used the laptop, ergo, no feedback to Dell or anyone else in the matter.....

Which is why I mentioned in the original comment "someone else could have used it happily all along...." (note the ellipsis, where the ending is left unsaid, as in, it c(w)ould have resulted in feedback, in the very least)